Westcott Triangle Ruler is made of smoke-tinted transparent acrylic. Westcott ruler is very light with beveled edges for smudge free inking. This drawing ruler resist scratches and breakage and the transparent finish allows you to view through the page while you draw or work on an assignment. These rulers have cut-out center for lightweight design and easy pick up. Westcott focuses on creating innovative designs that provide style and quality to an assortment of school, craft, and office products which are perfect for your drafting and drawing needs.